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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Seems to be dual MIT and Apache 2, although the "license in every subdirectory" makes it (a) not show up in the GitHub license detector (b) presumably places the burden upon the user to only use code from each directory or something https://github.com/SeaQL/FireDBG.for.Rust#license
NOTE:
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Hence, a higher number means a more popular project.